She had been a streetcar conductor for several years; what she liked about the job was the uniform and the constant motion, the changing scenery and the wheels rolling under her feet.
她干了几年有轨电车售票员的工作了；她所喜欢这项工作的原因是因为那身制服和频繁的移动，路经过的那些变化的景致和她脚下滚动的车轮。
The middle of the Latin word "Volvo", is rolling forward the meaning of a symbol of Volvo car wheels rolling forward and the company flourish, promising.
中间的拉丁语文字“VOLVO”，是滚滚向前的意思，寓意着沃尔沃汽车的车轮滚滚向前和公司兴旺发达、前途无量。
A coasting performance test is simulated on a chassis dynamometer, the transmission resistance, rolling resistance of wheels and their speed factors are measured.
利用底盘测功机模拟道路滑行试验，测定出汽车的传动系阻力、轮胎滚动阻力及它们的速度影响系数。
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